<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#253041"
            text-color="#ffffff"
            active-text-color="#20a0ff"
            router
         >
            <template v-for="item in items">
                <template>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        {{item.title}}
                    </el-menu-item>
                </template>
            </template>

        </el-menu>
    </div>
</template>

<script>
import bus from '../assets/js/bus'
export default {
  data () {
    return {
      collapse: false,
      items: [
        {
          icon: 'el-icon-document',
          index: 'Info',
          title: '系统首页'
        },
        {
          icon: 'el-icon-document',
          index: 'Consumer',
          title: '用户管理'
        },
        {
          icon: 'el-icon-document',
          index: 'Singer',
          title: '歌手管理'
        },
        {
          icon: 'el-icon-document',
          index: 'SongList',
          title: '歌单管理'
        }

      ]
    }
  },
  computed: {
    onRoutes () {
      return this.$route.path.replace('/', '')
    }
  },
  created () {
    // 通过Bus进行组件间的通信，来折叠侧边栏
    bus.$on('collapse', msg => {
      this.collapse = msg
    })
  }
}
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    background-color: #4a4a53;
    overflow-y: scroll;
}

.sidebar::-webkit-scrollbar{
    width: 0;
}
.sidebar-el-menu{
  font-weight: bold;
  line-height: 1px;
  letter-spacing:1px;
}
.sidebar-el-menu:not(.el-menu--collapse){
    width: 150px;
}

.sidebar >ul {
    height: 100%;
}
</style>
